FCM Integration in Expo App

I need a brand-new “Hello World” Expo project with Firebase Cloud Messaging fully wired up for both Android and iOS. Your job is not just to write the code but also to hand me crystal-clear, Linux-friendly setup instructions so I can compile, build, and test everything inside VS Code on my Ubuntu workstation. The end goal is to see a push notification arrive on two real devices (one Android, one iPhone) using the same codebase.

Key points you should know up front
• Framework: Expo (blank managed project)
• Starting point: fresh app—no existing code to migrate
• Timeline: 24 hours from contract start (ASAP)
• Budget: fixed at US $100

An\sw*er 5*6 so I can know you are a real person and that you have ready this please.